20 Most Recent Panasonic 144v Lithion Cordless Drill Ey7440ln2s Questions & Answers

The brushes of model EY7440 from between building year 2007 and 2009 have brushes what hangs split in the lengt. and have no pressure on the commutator of the ancre, if you have a multimeter and push the trigger (with a 14,4 battery connected) then you must have a voltage on the brushes , if there is no voltage on the brushes the switch could be damaged or you are forget to set the little steel springs in the middle on the brushes so set that they are pushing the brushes on the commutator collectors of the ancre ? good luck

check your messages from 3/14/09, I already answered the question but if you didn't get it let me know and I will resend it.

You have eliminated the trigger. So try this; clean off the armature with some electrical contact cleaner and a cotton rag check the brushes (may need to be changed) clean the sections where the base of the armature (and the top) articulate with the base of the motor add a graphite based lubricant to those areas before reassembling

The motor on this model was modificated WEY7546L1108 is the brushless motor assembly, but if there is warranty go to your dealer possible replacement by hidden-defects if it was an older serial was selled after a few years later with the 80A mosfets instead of 200A mosfets.

priority to plug in an other battery before buy another battery or charger

it is stamped in the housing usually around the battery area, on this tool it would be on the outside.

IF ......It, s an older model Panasonic EY with carbon brushes the armature (motor) and brushes allways both parts must be replaced for a longer lasting repair in that case but don,t forget to inspect the state of the wires and 2 mosfets that are placed on a separate heatsink below the switch look at that part either , if the tool is older then 4 years and you trust the switch no longer when in doubt do not repair. it, the marketing and warranty on Panasonic are now in better conditions . ask your dealer

Giving 2 short beaps and 2 red leds on it blinked . If its a EY7440 ? the control pcb must be the problem itself , but if its a brushless model then the 6 mosfets on the motor could be short circuit EY754* was oft the cause, but they have modified the motor for the new EY75** models with brushless motors .

Maybe a 14,4 v battery with 1,5 AH year 2013 bought ?? there where a few series of hidden defects that early time the early build s tool in combination with the EY7441. or the panasonic limegun . Go with the defect battery to your Panasonic service where you bought it , If they are not to lazy to the Panasonic after sales or agent they are wel willing to help you with Service on it . there is from this year more then only one year garantie on the tools of Panasonic but more on hidden defects when you explain the problem but when its fallen then its over because of a print or contact fracture

ITS does come off the same way turn clock wise the screw out and if the chuck is damaged it could not turn anymore then take of the little spring on the top of the chuck to take off the plastic from it and make the metal piece a little bit hot with a flame or fohn get a pipe wrench and setting the tool in gear 1 and couterclockwise from the machine or with a small hammer a little turn at one of the three claws

The pcb control can maybe defect ,when there are 2 flashing leds on the frontside of the battery holder. If the tool was made before 2008 there where splitting brushes they where made to soft, after this years there was a modification WEY7440L2307 a hard brushes assembly the tool may have for 10 years warranty if there where hidden defects if youre machine was made before 2008 , the dealer must know about that problem. PANASONIC have mostly hidden defects and modifications on brushes or the brushless engines by other models.

Its looks like drill carbon brushes had its life, try to get it replaced , if you got the model number its can be purchased for just few pounds

Try www.voltmanbatteries.com

you need to split the casing to check but be careful of any small parts inside coming outside suddenly good luck

Measure the voltage across the two terminals and if the voltage doesn't read over 15.0 volts take it back to the store or replace it.